Kent County Council has selected Enterprise to provide £45m-a-year’s worth of highway maintenance services.
The contract includes routine maintenance, winter services, emergency and out-of-hours response, drainage repairs, signs, lines, barrier and street lighting maintenance, and highways surface treatment work.
It will also include a range of highways improvement schemes.
The contract starts on September 1 and runs for five years, with the possibility of a five year extension, giving a potential total value of £450m.
Kent has one of the largest and busiest road networks in the country with more than 5,000 miles of roads.
Kent County Council cabinet member for environment, highways and waste Bryan Sweetland said: “We are committed to maintaining the network, improving road safety for all users and managing traffic flow to ease congestion.
"We believe it is possible to provide an excellent service through challenging economic times and we have chosen a supply chain partner which sees this challenge as an opportunity to improve services for residents.”
Enterprise executive chairman Alan Peterson said: “We are delighted to have been selected to work with Kent County Council to deliver these services.
"We have a dedicated highways team and a strong track record of delivering these services to local authorities up and down the country.
"This latest award will boost our presence in the highways sector. We are looking forward to working with an authority which is at the vanguard of service delivery.”